Improvement in apparatus for ascertaining the amount op acid in liquids



tluid to the zero point of the scale on tube O. An

linitell gime am epm.

Letters .Patent No. 99,976,

dated February 15, 1870.

IMPROVEMENT IN APPARATUS FOR ASCERTAINING- THE AMOUNT OF ACID LIQUTDS.

The Schedule referred to in these Letters To all whom it may concern:

Be it known that I, H ENRE TwITcHELL, ot the city of Cincinnati, in the county of Hamilton, and State of Ohio, have invented a new and improved Method oi Ascertainiug the Percentage of Acid in Liquids, and an apparatus therefor; and I do hereby declare that the following is a full and exact description thereof', reference being had to the accompanying drawings and to thev letters of reference marked thereon, making a part ot' this specification, in which- Figure 1l is all isometric perspective view, and

Figure IIl is a vertical section through the center linesot' the apparatus.

The apparatus consists of two glass jars A and B, placed side by side into a common base piece, L, and their open tops closed air-tightby metallic and closely fitting covers M and M', which are. cast to and form a part with'the hollowed bar F. This bar F contains a channel, N,to establish acominunicalion between the two glass vessels A and B..

Through the cover M of the vessel B passes the stem of the spoon H', and is made air tight by means of' thestufting-box K. Ontheontside end ot' the spoon stem is the milled button H forthe purpose of moving the spoon up and down and rotating it. l

.Both covers M and M', through the agency of the y connecting-bar F, are held tirmlyto their seats by means ot' the set-screw G, which is,held by the vertical bar E that is linked at the bottom to the staple D, which is firmly fastened to the base L.

Through the cover M of -vessel A, andheld by it, passes the graduated tube of glass C, to within ashoit' distance ofthe bottom of the glass jar A, and. extending outside to the requisite height, showing the graduated scale divided into hundredths and thousandt-hs. A `measuring tube, which contains two'hundred and fili y lluid grains, when lled tothe mark near the top, is furnished with the instrument.

i The mode of operation is as follows:

The vessel A is` iilied with water or any suitable amount of twolhundred and ity 'grains of the acetic liquid to be tested is poured into the 'vessel B. The spoon H'is then drawn up, so that when the covers M and M are in place it will not reach to the acetic liquid. It is then filled with bicarbonate of soda, or any other basic bicarbonate. Both vessels are then closed air-tight with their respective covers by bringing the set-screw G to bear and press tightly' upon the connectingbar F. 4 Thus prepared, the apparatus with its contents is ready tor the operati-on that is to be made foi-the purpose ot' ascertaining the parts of acid contained in the acetic liquid of vessel B.

By pushing the spoon H' with its carbonio cont-ents down into the acetic liquid and whirling it, around so as to facilitate zulmixture, carbonio acid gas is developed, which rises to the top of' vessel l, passes through channel N in connectin-glmrh to the vessclA, presses on the liquid contained therein, forcing the same upward in the graduated glass tube C, and the division to which it reaches indicates the tbousamiths olacid contained in the acetic liquid tested.

` I disclaim the measurement ot' the carbonicncid gas evolved in saturating theacctic liquid with a base, for the purpose ot' dedlicing thereliom the amount ot' acid contained; but having thus fully described the apparatus and its mode of action,

W hat I claim as myinvention and desire to secure by Letters Patent. is

1. The Inode of determining the amount ol' acid in acetic liquids. i.

HENRY TWITGHELL. Witnesses OJG. LEOPOLD, ED. BERGHAUSEN. 

